Understood one in church recalled architectural style (6)
I believe the answer is:
gothic
'architectural style' is the definition.
(Gothic is an example)
'understood one in church recalled' is the wordplay.
'understood' becomes 'got' (getting is a kind of understanding).
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'church' becomes 'ch' (common abbreviation).
'recalled' shows that the letters should be reversed in order.
'i' placed within 'ch' is 'cih'.
'cih' written backwards gives 'hic'.
'got'+'hic'='GOTHIC'
(Other definitions for gothic that I've seen before include "Style of mediaeval architecture" , "Architectural style in Europe 12th-16th centuries" , "Architectural or literary style" , "Building style of medieval cathedrals" , "Old-fashioned type" .)